Electrical roll-heating apparatus



Dec. 1924- 1,520,426

H. c. MOSLEY ELECTRICAL ROLL HEATING APPARATUS Filed Dec. 1923 3Sheets-Sheet 1 [/v VE/V TOR Dec. 1 4- 1,520,426

H. c. MOSLEY ELECTRICAL ROLL HEATING APPARATUS Filed Dec. 1925 5Sheets-Sheet 2 INVE/vroR. W;

I Arr-0R Y Dec. 23, 1924. A 1,520,426

H. C. MOSLEY ELECTRICAL ROLL HEATING APPARATUS Filed Dec. 1, 1925 3Sheets-Sheet 5 [N vz/v TOR I azgw I TTOR/VE Patented Dec. 23, 1924.

UNITED STATES PATENT OFFICE.

HARLEY C. MOSLEY, 0F PORTSMOUTH, OHIO, ASSIGNOR TO WHEELING STEELCORPORA- TION, OF WHEELING, WEST VIRGINIA, A CORPORATION OF WESTVIRGINIA.

ELECTRICAL ROLL-HEATING APPARATUS.

Application filed December 31, 1923. Serial No. 683,705.

To all whom it may concern:

Be it known that I, HARLEY C. MOSLEY, a citizen of the United States ofAmerica, and resident of Portsmouth, county of Scioto, and State ofOhio, have invented certain new and useful Improvements in ElectricalRoll-Heating Apparatus, of which the following is a specification.

This invention relates to roll heating apparatus, and it has for itsprimary object the provision of an electrical heating mechanism ofjacket form for application in embracing relation to a pair or set ofrolls, especially the reducing rolls of tin and sheet mills, wherebysuch rolls may be initially heated to the required high, or properworking, temperature prior to employment of the rolls for rolling hotmetal sheets and plates.

A further object is to provide an elec tric roll-heating apparatus whichmay be conveniently and quickly applied to and removed from the rolls asoccasion requires.

A still further object is to provide an electric heating device of thecharacter mentioned having a form or construction which practicallyeliminates danger of injury to the roll surfaces through burningproduced by short circuits in the electrical system which .forms a partthereof.

With these and other objects in view, the invention resides in thefeatures of construction, arrangement of parts and combinations ofelements which will hereinafter be fully described, reference being hadto the accompanying drawings, in which- Figure 1 is a view of theinvention, partly in end elevation and partly in vertical section,illustrating its application to a set of reducing rolls,

Figure 2 is a front elevation, partially broken, of the same;

Figure 3 is an enlarged longitudinal section of an end portion of theheater structure;

Figure 4 is a similar view of the opposite end portion, showing themeans provided for allowing free expansion and contraction of the spaceheater members; and- Figure 5 is a detail section on line 5-5, Fig. 4. v

Referring to said drawings, the reference numerals 1 and 2 indicate theupper and lower rolls, respectively, of a pair of hotmill reducingrolls, and 3 the mill housings.

Arranged on opposite sides of said rolls in complemental enclosingrelation to the latter, or to the major portion of the length of theworking surfaces thereof, are two similarly formed heater sections 4 ofjacketlike form. Each of said sections comprises an outer sheet-metalshield plate or cover 5 having an inner lining 6 of sheet asbestos orother material non-conductive of heat. The opposite lateral edges ofsaid cover 5 and said lining 6 are mounted, as by means of bolts 7, uponopposite substantially up right frame members 8 which are preferably ofangle-iron form in cross section. Each of said frame members has thatportion thereof which lies intermediate horizontal planes intersectingthe axes of the rolls 1 and 2 straight and vertically disposed, whilethe opposite end portions thereof are curved arcuately in substantialconformity to the curvature of the adjacent surfaces of the rolls aboveand below said planes. Also attached, as by means of rivets 9. to theconfronting faces of the inwardly, or radially, extending rib-likeportions of the frame members 8 of each jacket section are frame membersconsisting of upper and lower pairs of ring segments 10, also preferablyof angle-iron form. Said segments, as shown in Fig. 1, are approximatelysemicircular for embracing the adjacent roll throughout approximatelyone half the circumference of the latter.

Attached to the outer faces of the rollembracing portions of theoppositely disposed ring segments 10 are the opposite ends of aplurality of horizontal relatively-spaced electric heating elements 11,commonly termed space heaters, which may be of any preferredconstruction or may be of an or dinary commercial type. Thus mounted,said space heaters 11 are maintained adjacent to, but wholly out ofcontact with, the surfaces of the rolls and are adapted to impart heatto the latter by radiation and without the danger of injury to the rollsurfaces, due to short circuits of the electric current, which would beattendant upon the use of said space heaters mounted in contact with therolls.

Each of said heating elements, or space heaters, consists of a fiatribbon 26 of a suitable metal carried by a heater body 27 and insulatedfrom the latter by sheet mica 28. The opposite ends of said ribbon areattached to terminal clips 29 mounted upon the adjacent ends of saidbody and are suitably insulated from said clips, as by mica Washers 30.The current is carried to said clips by suitably arranged wires (notshown). One end of said body 27 is rigidly mounted on the horizontalroll embracing portion of the adjacent ring segment 10, as by a rivet31, while the opposite end is loosely held by a button-head rivet 32, asshown in Fig. 4, which permits substantially free lengthwise expansionand contraction of said body.

Lugs 13 fixed on the lower ends of the opposite jacket sections 4 inconfronting pairs are adapted to be attached by means of bolts 14 forsecuring said ends in fixed roll-embracing, or assembled relation. Theupper end of one of said sections carries one or more brackets 15 towhich are pivoted eye-bolts 16 carrying wing nuts 17 adapted to beengaged with brackets or lugs 18 carried by the upper end of theopposite section for securing said ends in readily detachable relation.

Each of the complemental jacket sections 4 has rigidly attached to itsouter face adjacent to its upper end a plurality of straps 19 havingpivotally attached thereto suspension members whereby they are supportedon tie rods or bars 20 extending between the upper ends of the housings3. Each of said suspension members comprises alined rods 21 and 22coupled together by a turnbuckle 23, said rod 21 having pivotalconnection with a strap 19, and the upper end of the rod 22 having ahook 24 formed thereon for detachably engaging the adjacent supportingbar 20.

Rings or loops 25 fixed upon the upper ends of the heater sections 4provide means of attachment for the carrying hooks of a. crane wherebysaid sections may be engaged for transporting the latter to and frompositions adjacent to the rolls.

In practice, the apparatus hereinbefore described constitutes aconvenient and readily applicable form of electric heater of heatradiating type whereby, when mounted in enclosing relation to a set ofrolls, the latter may be heated initially to, a proper workingtemperature following a period of idleness in which they have beencooled. As is obvious, the jacket structure substantially conforms tothe surfaces of the rolls with the space heaters disposed closelyadjacent and parallel to said surfaces. The structure is made of a sizeto accommodate the rolls when the latter are new, and it thereforerequires no adjustment to render it applicable to rolls of suchdifferent diameters as may result from the grindings frequently resortedto in polishing and re-surfacing operations.

The covers 5 and linings 6 of the jacket sections serve to preventoutward radiation of the generated heat and so to confine the latter itis effectively utilized for heating. the

embraced rolls.

What is claimed is l. A heater of the character described, comprising apair of complemental heater sections for mounting in jacketing relationto a set of rolls, and means for supporting said sections in suchrelation, each section comprising frame members shaped in substantialconformity to the roll surfaces to be embraced thereby, a plurality ofelectrical heating elements carried by said members in positions forlying adjacent to, but out of contact with, embraced rolls, and a heatconfining cover supported by said members.

2. A heater of the character described, comprising a pair ofcomplemental heater sections for mounting in jacketing relation to a setof rolls, and means for supporting said sections in such relation, eachsection comprising a frame including upper and lower pairs of ringsegments adapted to embrace the same side of the upper and lower rolls,aplurality of electrical heating elements carried by said segment inpositions wherein they are maintained out of contact with the rollsurfaces, frame members located outwardly with respect to said segmentsand having the latter attached thereto, and a heat confining covercarried by said members.

3. A heater of the character described, comprising a pair ofcomplemental heater sections for mounting in jacketing relation to a setof rolls, and means for supporting said sections in such relation, eachsection comprising a frame including upper and lower pairs of ringsegments adapted to embrace the same side of the upper and lower rolls,a plurality of electrical heating elements carried by said segments inpositions wherein they are maintained in parallel spaced relation to theroll surfaces, said elements being relatively spaced and having asubstantially semi-cylindrical arran ement on each pair of saidsegments, an a heat confining cover carried by said frame.

4. A heater of the character described, comprising a pair ofcomplemental heater sections for mounting in jacketing relation to a setof rolls, each section comprising a pair of substantially upright framemembers having their upper and lower ends arcuate- 1y curved formounting in overlying and underlying relation to a side of the upper andlower rolls, respectively, upper and lower pairs of ring segmentscarried on the inner sides of said frame members, said segments beinglocated to embrace the adjacent sides of said rolls, a plurality ofelectrical heater elements carried by each pair of segments, and a covercarried by said frame members.

5. A heater of the character described, comprising a pair ofcomplemental heater sections for mounting in jacketing relation to a setof rolls, each section comprising a pair of substantially upright framemembers having their upper and lower ends arcuately curved for mountingin overlying and underlying relation to a side of the upper" and lowerrolls, respectively, upper and lower pairs of ring segments carried onthe inner sides of said frame members, said segments being of angle barform in cross section with the inner member thereof disposedhorizontally and parallel to the surface of the embraced roll, aplurality of electrical heater elements carried by each of said pairs ofsegments on the outer surfaces of the said inner members thereof, and aheat confining cover carried by each of said frame members.

6. A "heater of the character described, comprising a pair ofcomplemental heater sections for mounting in jacketing relation to a setof rolls, each section comprising a frame, a. plurality of heaterelements carried by said frame and arranged to partially encircle a sideof the upper and lower rolls of the set, a heat confining cover carriedby said frame, means for attaching together the opposite heatersections, and suspension means for each of said sections.

In testimony whereof, I aflix my signature in the presence of twosubscribing witnesses.

HARLEY C. MOSLEY.

Witnesses:

H. K. BAUER, R. E. Pearl.

